Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Components of AOCI (Details)

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Stockholders' Equity - Components of AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ 705,464 $ 707,229 $ 740,737 $ 1,277,179
Accum. other comp. income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (958) 5,992 $ (5,792) $ (15,265)
Defined benefit and other postretirement plans         
Tax        
Tax related to AOCI (4,344) (4,078)    
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 612 (508)    
Net gain (loss) from hedging activities        
Tax        
Tax related to AOCI (4,385) (9,057)    
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 12,546 24,672    
Foreign currency translation         
Tax        
Tax related to AOCI 8,177 8,177    
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ (14,116) $ (18,172)